Shanna's response came after a user commented on her latest Instagram post asking how she felt about the pregnancy.
"[Any] thoughts on the new baby?" the user wrote under the post.
Shanna responded and said she was "very excited for them" and shared her hope that "they have a great experience bringing in a new life to the world."
If you missed it, Kourtney announced her pregnancy this weekend at Travis's Blink-182 show by holding up a sign that read, "TRAVIS I'M PREGNANT."
It was inspired by Blink-182's music video for "All the Small Things," in which a fan held up a sign with the same message.
Travis and Kourtney already have a blended family of six kids. This includes Kourtney's three children with Scott Disick: Mason, 13, Penelope, 10, and Reign, 8. And Travis's and Shanna's kids Atiana, 24, Landon, 19, and Alabama, 17.